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For the other carbine variant of the M16, see CAR-15. For the Remington Arms version of the carbine, see R4-C.

The M4 is an assault rifle designed in the 1980s by Colt's Manufcturing Company, LLC, which is a carbine variant of the M16. The M4 fires the 5.56x45mm NATO cartridge and is the standard small arm of the US Army. The M4 is capable of semi-automatic and burst fire modes.

While the original M4 does not appear in the Rainbow Six universe, one of its variants do, erroneously referred to as the M4;

  • The M4A1 is a further improvement of the M4 carbine rifle, developed in the late 1990s. The M4A1 has a removable carry handle and is capable of semi-automatic and fully-automatic fire modes. The M4A1 is used by special forces units in the American militaries.

The M4A1 is categorized as an assault rifle in the Rainbow Six universe.

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